Refrigerating apparatus



Dec. 2,1941. M. w. BAKER REFRIGERATING APPARATUS Filed May 26, 1939Patented Dec. 1941 UNITED. ST T PATENT OFFICE I nsrarasnzfigirrmros 7Marshall W. Baton-Dayt Ohio, assignor to General Motors Corporation. Dan. Ohio, a

corporation of Delaware frigerant condensing unit.

Application my 26, 1939, Serial No. 215.95:

3 Claims. (01. ca -11s) This invention relates to refrigeratingapparatus and more. particularly to means for circulating air over thesurfaces of-the condenser of has been customary to provide a fan on theadlacent end of the motor shaft and sometimes to provide fan blades inthe flywheel of the compressor. With this type of air circulation onlythe portion adjacent the motor fan obtained adequate air cooling becausethe flywheel fan was not driven at a sumcient'speed nor locatedsuflicientiy close to the condenser to provide adequate air circulation.I

It is an object of my invention to provide a simple inexpensiveeflicient means for providing better air circulation for the condenserof a re- It is another object of my invention to provide emcient aircirculation over a. greater condenser area. I

It is another object of my invention to provide a second fan driven atan eiiicient speed for circulating air over a portion of the condenserof a refrigerant condensing unit.-

It is still another object of my invention to providea plurality ofmotor driven fans each driven at an emcient speed and located to obtainthe greatest efliciency for circulating air tion of the condenser of thecondensing'unit in front of the flywheel of the compressor.

Referring now to the drawing there is shown a motor compressor base 20upon which is mounted a refrigerant compressor 22 provided with a largeflywheel pulley 24 connectedby a plurality of belts 26 to a motor pulley28 providedupon the-front end of the motor shaft of the electric motor30. The electric motor 38 is fastened by an adjustable connection to thebase 28 so that it-may be located so as to keep.

the belts 26 in a sufliciently tight condition. The

cylinder head of the compressor 22 is connected by a refrigerant conduit82 to the upper portion of a fin and tube type condenser 36 which ismade substantially as long as the base 2!! and about as high as thecompressor 22 in order to make the condenser unit compact and heat inappearance. .The refrigerant is-condensed within the fin and tube typecondenser and the condensed refrigerant is conducted through a liquidconduit 86 to a receiver 38 located beneath over the greater portion ofthe surfaces .of the condenser of a refrigerant condensing unit.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawing wherein s preferred form of the present invention is clearlyshown.

In the drawing:

Fig. 1 is a planview of a refrigerant condens- 4 ing unit embodying myinvention; and

Fig. 2 is a view in elevation of the refrigerant condensing unit shownin Fig. l.

Briefly, Ihave shown a refrigerant condensing unit which is in generalconventional except a ing for the fact that the motor driven fan isprovided with a pulley and a belt connecting to a second pulley which isprovided on the hub of the base 20. The condenser 36 is provided with ashield 30 in the form of a relatively deep flange which extends aroundits periphery and forms a sort of enclosing and supporting frame for thecondenser 36. This shield at is connected to the base 28 by the anglebrackets Hand M. e

The front end of the motor pulley 28 is provided with an extension whichcarries a twoblade propeller type fan 56. This fan is located close tothe condenser 84 within the confines of the shield 60, so that itefliciently draws air between the fin and tube surfaces of the condenser16. The shield 40 serves as a guard for the fan at as vwell as preventsair from being drawn into the fan stream without passing through thecondenser 34. It will be seen' that this fan 48 can only efllcientlydraw air through about one-half the surfaces of the condenser 35. Theremaining portion of the condenser which is located in front of thecompressor receives little or no benefit from the fan 63. It will alsobe seen that if a fan were provided inthe flywheel pulley of the 5compressor 24 that such fan blades would not be located suiiicientlyclose to the condenser 34 to provide e'ilicient circulation of the airthrough this portionof-the condenser. The flywheel pulley 24 alsorotatesat a'relatively slow speed so that it would not provide an ancient formof air circulation.

In order to provide efficient air circulation for the other portion ofthe .condenser 34 I have provided a second two-blade propeller type fanan auxiliary fan located adjacent the other pen to 48 which is like thefan ll" and which is driven by a V-belt from a V-belt pulley groove 2provided in the extended hub of the motor pulley 28. The hub 54 of thefan II is also with a v-belt type pulley groove for receiving the vbeit58. Preferably the'belt groove I! and the belt groove in the hub ll areof the samediameter so that the fans 4| and 48 operate at substantiallythe same or motor speed. The hub I4 of the auxiliary fan is rotatablymounted upon ball bearings carried by a stationary shaft II which isfastened to a plate". Thi plate ll in turn is fastened by cap screws tobrackets it which are copper-hydrogen brazed to the adjacent fins of thecondenser 34.

Thus by this auxiliary fan the portion or use from said compressor andadjustable independent of said driving means between said elements.

condenser 84 in front of the compressor 22 is provided with as great aircirculation as the portion in front of the motor 30. The auxiliary fan"'2. A refrigerant liquefying unit comprising, a comprusor elementand amotor element located at a sideof the compressor element, the shaftsofsaidelements beingdisposedinparallelrela-- tion to one another, acondenser confronting and 48 may be belted so that it can operateatthemost efiiclent speed or it can be belted so' as'to'v operate at thesame speed as the fan It so that a fan of the same size may be used inboth positions. This arrangement islessexpensive than the use of aflywheel fan and is also more efiicient. This arrangement also makes itpossible to use thinner, more efficient condensers of greater frontalarea. It also makes it possible to use the more efficient quiet two-blade fans although three or more blade fans may also be used.

It is of course not necessary that the bearing support for the auxiliaryfan be mounted directly upon the condenser 34, but this bearing supportis mounted upon any desired available support. While I find the beltdrive between the motor 40 and the auxiliary fan to be the most convenlent arrangement other arrangements such as a belted or geared drivefrom the flywheel pulley might be used to drive the auxiliary fan." Forother shapes and sizes of condensers more than two fans may be used toobtain better air circu- ,lation. Thus, by. my invention I have providedmore emcient air cooling for the condenser and thereby haveprovidedmeans for increasing the efiiciency of refrigerant condensing units withlittle or no expense.

While the form. of embodiment of the inven-' tion as herein disclosed,constitutes a preferred form, it is to be understood that other formsmight be adopted, all coming within the scope of the claims whichfollow.

What is claimed is as follows:

1. A refrigerant liquefying unit comprising, a compressor element and amotor element located at a side of the compressz; element, the shafts ofsaid elements being disposed in parallel rela-" tion to one another, .acondenser confronting and extending substantially across said motor andcompressor elements and being disposed substantially perpendicularly tothe axis of said shafts,

means associated with the shafts of said elements and iorminga drivingconnection therebetw, said driving connection located intermediextendingsubstantially across both of said motor-and compressor elements andbeingedisposed substantially perpendicularly to the axis of said shafts,means associated with-the shafts of said elements and forming aconnection therebetween for driving said compressor at a reduced speedof rotation with. respect to the motor, said driving connection beinglocated intermediate said elements and said condenser, a firstfan-adjacent one portion of said condenser mounted upon the shaft ofsaid motor and rotatable therewith, another shaft rotatably carrying asecond fan adiacentanother portion of said condenser, means associatedwith said motor shaft and forming a connection with said second fancarrying shaft for driving said second fan atsubstantially the samespeed of rotation as the rotation of said first fan and at a higherrotative speed than that of said compressor shaft, said fa'n drivingconnection being disposed between said fans and said driving connectionof-said elements, means for mounting said second fan carrying shaft uponsaid condenser, and said mounting means for said second fan' carryingshaft being adjustable independent of said driving connection betweensaid elements.

3. A refrigerant liquefying unit comprising, a compressor element, amotor element and a condenser, means associated with the shafts of saidelements and forming a driving connection therebetween, a first fanadjacent one portion of said condenser mounted upon and rotatable withthe shaft of one of said elements, another shaft rotatably carrying asecond fan adjacent another portion of said condenser. means associatedwith the shaft of said one element and forming a driving connection forsaid second fan, means for mounting said second fan-carrying shaft uponsaid unit, and said mounting means for said second fan-carrying shaftbeing separate from said elements and movable relative thereto foradlusting the driving connection between said first and said second fansindependently of the driving connection between said elements.

